Johann Michael Wittmann, a single craftsman (Handwerker), settled in the Volga German colony of Herzog on 14 July 1766 and is recorded there on the 1767 census in Household No. 30.
The 1767 census records that Johann Michael Wittmann came from the German village of Regensburg.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Hr09.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 95.